Specifications

58 Optimizing IBM Netfinity Servers for SAP R/3 and Windows NT
2.12.3 Configuration ServeRAID Adapter
The next steps cover the RAID configuration for the Windows NT installation with
the ServeRAID offline tool from the IBM ServeRAID and ServeRAID II
configuration diskette.
The Windows NT installation for SAP R/3 is usually made on the 4.5 GB hardware
mirrored hard disk drives. We recommend that you create one logical RAID-1
drive with 4000 MB on these drives of the ServeRAID adapter, and use the
remaining space for a second Windows NT installation on a second logical drive.
We recommend you do a second Windows NT installation for emergency and
recovery purposes. If there is a problem in your Windows NT system, you can
boot the second Windows NT installation and get access to all NTFS formatted
drives to see what has happened and correct the problem, and save or restore
data.
You will find further information about installing ServeRAID adapters in the
ServeRAID adapter documentation and in the redbook
Implementing PC
ServeRAID SCSI and SSA RAID Disk Subsystems,
SG24-2098.
The following steps describe the ServeRAID configuration with the ServeRAID
Configuration utility.
The ServeRAID adapter is able to create logical drives with
different RAID levels in RAID arrays. If you plan to use Hot Spare
Drives do not create the second logical drive as RAID-0 for the
second Windows NT installation. Hot Spare Drives do not stand in
for arrays containing RAID-0 logical drives.
Hot Spare Considerations
The ServeRAID adapter-created logical drive is seen by the
Windows NT system as one physical disk. If you create only one
logical RAID 1 drive over all disk space and install the second NT
on a second partition on the first logical drive your first Windows
NT installation would be on a primary operating system partition
and your second Windows NT installation on a extended partition.
Instead there are two logical RAID drives in both Windows NT
installations on separate primary partitions.
Note
Only one logical drive should be created for the installation
process. If any other drives are defined and you are trying to install
to a partition greater than 1 GB, this will cause problems. After
installation is complete, you can then go back or use the
ServeRAID Administration and Monitoring Utility in Windows NT
and add the rest of the logical drives that you need. Also, NT can
only install to a partition that is 4 GB or less. Therefore, you may
want to make the first logical drive 4096 MB in size.
Windows NT Installation and Logical Drives